Use git-lfs for pdfs.

.gitattributes

add_ons/reparam_cm/reparam_cm.pdf

doc/EPS/bary.pdf

doc/EPS/circ.pdf

doc/EPS/coarse_atomic_2d.pdf

doc/EPS/coarse_atomic_3d.pdf

doc/EPS/cubic_orient.pdf

doc/EPS/curved_simplex.pdf

doc/EPS/edge_tetra.pdf

doc/EPS/edge_tria.pdf

doc/EPS/ellipt_mesh.pdf

doc/EPS/ellipt_uh.pdf

doc/EPS/heat3d_ntria.pdf

doc/EPS/heat3d_tau.pdf

doc/EPS/heat_ntria.pdf

doc/EPS/heat_tau.pdf

doc/EPS/linear_dof.pdf

doc/EPS/macro1d.pdf

doc/EPS/macro2d.pdf

doc/EPS/macro34.pdf